How we rank
Every chamber is scored on specs, FDA status, and evidence. Rankings are not for sale. A paid placement does not change rank, score, verdict, or comparison text.
The best-chambers page already publishes the criteria used for that list. They are repeated here so the method has a stable URL. Nothing on this page adds a ranking factor that is not already stated on those pages.
Criteria already published on Best Chambers
Pressure (ATA): Higher pressure delivers more dissolved oxygen. We prioritized chambers reaching 1.3+ ATA for wellness and 2.0+ ATA for clinical applications.
FDA Clearance: FDA-cleared devices have been independently evaluated for safety. We weighted FDA 510(k) clearance heavily, especially for home use.
Build Quality & Certifications: We looked for ASME PVHO-1, ISO 13485, CE Class IIb, and other quality certifications beyond basic manufacturing standards.
Real-World Reputation: Clinic adoption rates, professional athlete usage, published studies, and warranty track record all factor into our rankings.
Value: Price relative to capabilities. An $8,000 chamber that delivers 90% of the benefit of a $25,000 chamber deserves recognition.
Paid placements
Clinics and chamber brands can pay for a featured slot on a city page, the clinic directory, a best-of or category page, a chamber page, or the homepage. The slot is labeled Sponsored. It is a paid placement. It is not part of the ranking.
Payment does not change order, score, verdict, comparison text, or the ItemList positions in structured data. The clinic or chamber stays where the editorial sort put it. The paid slot is a separate block above that list.
Industry reports and concierge advisory are separate work. They do not change rankings either. Ask about a placement.